What is White Mountains Insurance Group's casualty-active — 3?

White Mountains Insurance Group (WTM) reported casualty-active — 3 of 11.4% in Q4 2025.

How has White Mountains Insurance Group's casualty-active — 3 changed year-over-year?

White Mountains Insurance Group's casualty-active — 3 decreased by 1.7% year-over-year, from 11.6% to 11.4%.

What does casualty-active — 3 mean?

Measures the change in estimated liabilities for claims occurring in previous periods for the Casualty-Active portfolio. It serves as a key indicator of reserve adequacy and the effectiveness of the company's actuarial reserving process.

White Mountains Insurance Group WTM Casualty-Active — 3

Other product segments

Property and Accident & Health

18.4%+0.5%

Marine & Energy

17.3%-11.3%

Casualty-Runoff

15.3%-1.9%

Specialty

13.2%+21.1%

Similar metrics at other companies

ACGLCasualty — Total of IBNR liabilities plus expected development on reported claims

92,800,000,000%+24,800,000,000pp

EGCasualty Insurance — Year five

24.9%—

CINFCommercial Casualty Line — 3

18.7%-0.1pp

KNSLCasualty - claims made — Total of IBNR liabilities plus expected development on reported claims

$122.57M+18.0%

KNSLCasualty - occurrence — Liability for claims and claim adjustment expense, net

$1.79B+29.1%

WRBCasualty — Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net

$2.26B+4.3%

Other financials

Income statement

See full

Revenue$517.8M-10.4%

Gross profit$475.1M-16.7%

Net income-$27.2M-180%

Balance sheet

See full

Total debt$834.8M+23.5%

Total equity$5.4B+19.2%

Total assets$13.2B+19.7%

Cash flow

See full

Operating cash flow$30.5M+176%

Valuation

See full

Market cap$4.99B+9.8%

Profitability

See full

Gross margin94.9%-3.7pp

Net margin28.4%—

Returns & leverage

See full

Return on equity21.2%—

Debt / equity0.2×0.0×

Where this comes from

Reported directly by White Mountains Insurance Group in its filing.

Tagged under the XBRL concept us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree.

The official record: White Mountains Insurance Group’s 10-K, filed February 27, 2026, on SEC EDGAR. View the filing →

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Questions, answered.

What is White Mountains Insurance Group's casualty-active — 3?: White Mountains Insurance Group (WTM) reported casualty-active — 3 of 11.4% in Q4 2025.
How has White Mountains Insurance Group's casualty-active — 3 changed year-over-year?: White Mountains Insurance Group's casualty-active — 3 decreased by 1.7% year-over-year, from 11.6% to 11.4%.
What does casualty-active — 3 mean?: Measures the change in estimated liabilities for claims occurring in previous periods for the Casualty-Active portfolio. It serves as a key indicator of reserve adequacy and the effectiveness of the company's actuarial reserving process.